There is no such setting on my Roku.
Can not find it on Roku 3 or Roku Ultra LT.
Hi @UncleNine
Thanks for reaching out to the Roku Community.
Changing the theme pack is a simple way to personalize your Roku experience with a single selection.
You can browse and change theme packs from the Settings menu using the steps below.
On various occasions, Roku releases seasonal or sponsored themes that only appear for a short period of time. You can disable them by going to Home>Settings>Theme>Seasonal or Sponsored Themes, then selecting Off to disable these themes (or selecting On to enable them).
Learn more here. How to change the theme pack to adjust the look of the Roku® interface
Please keep us posted on how it goes!
All the best,
Mares